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/* Copyright (C) 2010 Wildfire Games.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* I/O completion port
*/
#ifndef INCLUDED_WIOCP
#define INCLUDED_WIOCP
#include "lib/sysdep/os/win/win.h"
// this appears to be the best solution for IO notification.
// there are three alternatives:
// - multiple threads with blocking I/O. this is rather inefficient when
// many directories (e.g. mods) are being watched.
// - normal overlapped I/O: build a contiguous array of the hEvents
// in all OVERLAPPED structures, and WaitForMultipleObjects.
// it would be cumbersome to update this array when adding/removing watches.
// - callback notification: a notification function is called when the thread
// that initiated the I/O (ReadDirectoryChangesW) enters an alertable
// wait state. it is desirable for notifications to arrive at a single
// known point - see dir_watch_Poll. however, other APIs might also
// trigger APC delivery.
// @param hIOCP 0 to create a new port
extern void AttachToCompletionPort(HANDLE hFile, HANDLE& hIOCP, ULONG_PTR key, DWORD numConcurrentThreads = 0);
extern Status PollCompletionPort(HANDLE hIOCP, DWORD timeout, DWORD& bytesTransferred, ULONG_PTR& key, OVERLAPPED*& ovl);
#endif // #ifndef INCLUDED_WIOCP
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